Grants anonymous access to any Amazon S3 object or bucket. Any user will
be able to access the object by omitting the AWS Key ID and Signature
from a request.

Amazon highly recommends that users do not grant the
AllUsers group write
access to their buckets. If granted, users will have no control over the objects
others can store and their associated charges.

Grants access to buckets or objects to anyone with an Amazon AWS account.
Although this is inherently insecure as any AWS user who is aware of the
bucket or object will be able to access it, users may find this authentication
method useful.

Grants access to Amazon S3 log delivery so that an S3 bucket can receive
server access logs. Turning on server access logging for an Amazon S3
bucket requires that the bucket receiving the logs is granted permission
for the log delivery group to deliver logs.